Ultrashort pulse generator

Ultra-short pulse generator is very important for ultra-high resolution radar, spread spectrum communication technology and many other applications that need broadband radiation. To some extent, the formation technology of ultrashort pulses has become the core technology in many broadband applications. At present, a lot of research on this technology focuses on GaAs optical switches driven by laser diodes, but these devices can not work normally under the condition of less than 200 ps. At the same time, there are still problems in repetition rate and reliability of laser diodes. Other methods to generate high-speed transient voltage include GaAs thyristors, but it will take some time for GaAs thyristors to become mature products.

The formation of ultra-short pulse has the following characteristics: first, it can generate 100 kW pulse with pulse width less than 1 ns, which can be powered by 1 W DC power supply. Secondly, this scheme adopts mature devices that are easy to buy in the market.

The ultrashort pulse generator will use the avalanche breakdown principle of diode transit time to change the input narrow pulse into ultrashort pulse signal. Avalanche diode has attracted great attention from the beginning. Avalanche diode can be made into microwave generator and amplifier, which has made great progress in theory and practice. Here, the ultrashort pulse generator will be made of avalanche diode.